Students make their selections from the salad bar during lunch at Francisco Middle School on Tuesday, November 8, 2011 in San Francisco, Calif. Lunches for the day included chicken nuggets with sweet potatoes, mac and cheese with mixed vegetables, turkey breast and pepper jack cheese on wheat sammie and bean and chicken tamale with rice along with salad bar and selection of fruit. According to a new report from the California Center for Public Health Advocacy, the percentage of overweight or obese children fell 1.1 percent from 2005 to 2010. Improvements in the San Francisco Unified School District (SFUSD) school meals include the improvement of it's vegetable offering by increasing the amount of dark green and orange vegetables. SFUSD meals which do not contain artificial flavoring or colors and and does not permit trans fats except for naturally occurring fats in beef and cheese, which are not considered a health risk. There are salad bars at all middle and high schools and elementary schools without salad bars serve a fresh pack of vegetables to its students and include fresh produce and whole grains each day.

In a taste test of new lunch items last year in the Long Beach Unified School District, the fiesta salad received a nearly 73 percent approval rating. One student even declared that the dish of pinto beans, cilantro, corn, tomatoes and cayenne pepper was "better than McDonald's."

Yet the salad was a flop when the district put it on the menu this year.

Long Beach Unified isn't the only district in California dealing with lunchtime trial and error. In an effort to get children to eat healthier foods, new federal nutrition standards require schools to offer more fruits and vegetables, regulate calories and emphasize whole grains, among other changes.

A recent statewide survey shows that although students overwhelmingly support the new nutrition standards, most are tossing the foods they don't like. About 40 percent of students say they eat school lunches in their entirety, according to the survey commissioned by the California Endowment, which provides funding to a number of media organizations, including California Watch.

Schools are "trying to expose kids to more fruits and vegetables and whole grains; that kind of behavior doesn't happen overnight," said Nicola Edwards, a nutrition policy advocate at California Food Policy Advocates, which works to improve the diet of low-income people.

The survey, conducted this month by the public opinion research firm Fairbank, Maslin, Maullin, Metz and Associates, found that 73 percent of students in grades 7 through 12 were aware of changes to school lunches this year and that 82 percent supported the changes.

But what students support and what they'll actually eat are not always aligned. At Long Beach Unified, vegetables, in particular, have been a tough sell.

"We've seen them just take the item and just put them in the trash can," said Cecelia Slater, the district's nutrition services director.

Slater is working with school administrators to help them understand and promote the new nutrition standards and figure out which foods students will eat. (Lessons learned so far: Spicy jicama sticks are a hit, and prepackaged edamame is less popular than anticipated.)

Slater plans to do the same with parents - 91 percent of whom, according to the survey, support the new meal standards.

Getting parents to also serve healthier foods at home "is really a challenge," Edwards said.

"We're making these changes in the schools and really trying to expose kids to fruits and vegetables, to the healthier stuff," Edwards said. "If they get home and they're just eating junk food, what does that message say?"

Families can face many challenges in getting healthy meals on the table, including time and access to healthy foods. Still, Edwards said, many schools are trying to involve parents by sending menus home, sharing recipes and providing nutrition education resources.

"We're hoping that the students embrace these changes a little more as time goes on and they get used to it and parents learn more about it," she said.

Slater said she hopes parents will encourage their children to make healthy food choices and not be wasteful. "Good nutrition that's not eaten is not really good nutrition, after all," she said.